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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36cd68195322f81966c7b023c47ded1990e2b71cec8b93277b6dc7898041bc9d' 
  AND token = '7z0HjNXixp2Sg+1pLZXPU8Rn1CWzykJ0zRwFvCFNhl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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