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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc128eed64d6da54ba7a52f39c69d7fcaa96f55b37459927e29649fcca4742f6' 
  AND token = '9/0wfiyWQAfys+WbEJJYz0doC+8NU0PjtU8hSbeMru4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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