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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b07c8c2e0c47a60a9ee3aa93bd716384bc977b711620d5061d7597f29c3ef9ca' 
  AND token = '3x0R+D+mK/1NCpZIAbThWmmrutp8HuGUzafMPbmPnD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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