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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '955ca4fb7e3404c47cc46f071a70d77ee96461ecb5909f291a4a2690db25994b' 
  AND token = 'ir4OZT6FW2e9q16ZYThNahazJnY5toMp2uL6rM5AfaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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