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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c943b619de77972acf87afcdca29afde041b2d0e20a7f71f21a10c2f0ec612d9' 
  AND token = 'c2dhI1TYFU5OAuXkjeZ3Gsz6+2edhmSuIs8Wl+yraXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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