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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37bca36590c550c96dd84ff690bcf9fd448e4cb77fa12eb1e5022b263a1a26ae' 
  AND token = 'w9noSot9Ijl7nzNf+5rysSVeMp84uSOUTiqm5Td+TYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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