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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5351e0bbc03409cb91d1473c30b04f8806f62e7a8a758c2d9b89f9d5d05294b' 
  AND token = 'e16LTRwHTp6EbEv8LGa04AAH26TCdOaDuZ+yaNmg+hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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