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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8aa7965efdee0e5f2ffb971b079de5f90895f30ac8e7dc28af2e2e02d5e908a4' 
  AND token = 'BzgllgWc64M69eA26K9WTILSILrtzpt4h7WI4nDiVCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}