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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '751815dec09eac4843c7aecf962a6d1d694e78d27e2e9a69bab557d3223e713e' 
  AND token = 'zDGbaeUwWTmzZDytutp3IVRZ8EQARFXKNYTMZBa+Opk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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