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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c813f42f87fbdbc0602a3a4bc8dbcce84eabf1a29382cd6019cc5f831de2b8a2' 
  AND token = 'N1ZPFFZOIboxr7yG3SiiPb8KpIVLk8K7MwP+FrHpYSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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