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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04f451e3ede3b32a42882c298bffda557ecb7adcf392d65cdf5d0c6ddcfa1ff1' 
  AND token = 'Zf7iAGN80gJg8mMnqsoDr3tez9IWB+gJ6l2EKixNkgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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