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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f2994ab3b66cd648ce559437af657990911d9a029f4f6ef19987d1f32426b26' 
  AND token = 'qEGBmAUOTRjy1Y59MyuKxHsMzk9k01XqVljkEfkQeqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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