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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c2c11733a62f3028b3466342f0f9a793febf99a5d0365a623b6e05bce9037ec' 
  AND token = '9m4wsH+DbeH0MS6ANA941EmAdCuzJ49YjP9X8yG2Isw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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