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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ee46b1bf51bf04bcf4055d835a73302bea89c6aeb1441849c1e6debb7a287a6' 
  AND token = 'ooRCSm7KdGn1YwMHJRgbkf6FteKn35dHEiTlqPGw23A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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