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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abc585915a0f0db05640cd925a6bb3779bff3a89cf4703d35129fcdb2779ef4e' 
  AND token = '6LJAWQUFXQU7VnbC6ClEbr+bqWtX/yBboJjJn2xU32Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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