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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb6810f61d1652dd2204a2cdff91be123d26669b493071536f818e734973e1bf' 
  AND token = 'NZMnk6MYKfJJqT93T7D0vvkJ2Y9j/EOIm09bFVfWJPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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