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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66e2ac8707ef5cb120aa85dda0e61e7010d4d7da5f93757e2059a2593bf5bd76' 
  AND token = 'E0YzxidwALxZQVqaphPtyb1fD1T1Vq3V2yvOpAiJzVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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