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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a24327e9d86b8ac286f99961d35e63a7d6949ecaa5b710c8a165e26389ef705' 
  AND token = '3EstV5hk0riwcjxH+f+bT+A6mCKjXHP9UJalbcqtI8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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