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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4763e1ffcd757cf3f92d3e9e2feeafc7e722e3be183cf535635537b2c1efc569' 
  AND token = 'AyBqzfNp9VWIW4A8y3Oz3j9F/p18F9nwMjTuQNI3yX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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