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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6812027b6c64c715d63c7fceb9e2de636590767d12be17357a9309d0b7665621' 
  AND token = '/wrCqVL2mmg366UhBdWaOE36df7StET+f5RAqS64euE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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