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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ae6cd692e130fca78b2e2998db41a6417eed12bc7b4dd86825233fc18297f2d' 
  AND token = 'E17R6F3+U9hQ3WNWcgHpbBXq8ch8fVBnvmj56sdOvL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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