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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9523b78c4419082ed671bd504fdc4c290961dfb7d072a4d059cd089c84de0966' 
  AND token = 'MvXCTDvjlUOm8xwSpPtk64R67Pl+GIfODIIaNe7C5JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00608

JSON explain

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