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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b52935d4793cca4530ba449631162bb715a57ea7f52bc69562aa0ee1d1f6e2c' 
  AND token = '7jl9xAfN8HV3knErLMfQ0A94x6fuZ3P5w6NUTZUnwPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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