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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe340185946c2d4f2a070fb4fddb6b4e00a77a5d7ae9f0ef28ef24baded4c7a6' 
  AND token = 'u10JrAFXfOk6h/1zxtXRzufmRJ8Z3ygwBPWtoe4aMgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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