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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bd289c66f7533798693988ef3e7860dc410ea49fb5466a972809f29754f9d0d' 
  AND token = '2dGy51pqMW5TGDycbiUv7D1MVOA3FNnL8y44+RTsJu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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