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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74a37cfbec4202f8689220a185b9590594ebfce2ee9e1445aa6b4b1d0ad167ff' 
  AND token = 'M24Ruex7luMul2SrEvJOrGwXtbNvBn5bxvEQaBLK0/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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