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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb76d84e5988a92e33ddcb5a0c548d288f27a724a74ec5cdcbdcf19b93eab16d' 
  AND token = 'rjLzcib36Eo5m9aZoyqfPE8U75eNDO99VTycxhx/Grg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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