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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b9ec21bf12e7fd99776811c39733ae7bfe8fccb948c0a7715e3b7d8274d08a5' 
  AND token = 'H4RbBlkG5H66JIyzxeHTjA/DtjJoFaAmpkEjx5FHqUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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