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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f08bdd216ed99045e0c136a70b6221db03759671314858c827596b67d77e50ab' 
  AND token = 'IIPg3pj1GL6eeAV4R3BIYtIfn6JygDAFaln5oFv5VL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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