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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '960338e6e9d9da80ebaefccce67014c2b8821a18a1e4f9567aadcf8cfcc0e5eb' 
  AND token = '+O4edCgN8IoYFNWq9L0t88z4grj78GaNrwUadJ7Y9K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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