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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4781cf3eab6c46ee9f09fdf5e0c7d9f625304c3ad962da7e9d930e52d558d5d1' 
  AND token = 'hafZbn+6CxE+9QoRmhrA/S7tFqJgEUp2IFiXp1Z35wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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