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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26a112b79370bfc798fd8e701d11b2bc3aa9c1b7414812931500662523ce4a30' 
  AND token = 'vo0oi+DfONJnkBGzeE7R/UJkcrz7cdxVs+eF2W01JUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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