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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '787fa4a818e4f51de91a3977c928b9d326972cd20bdc68d160be760b478f6792' 
  AND token = 'Cca2DFz5bZuGadchD0CkslJtUakliIZIs+EBnvM5sNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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