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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78f1a7f93985bc2491ab0870d398f0819670ad528c3fbcb0d044e75503c5b134' 
  AND token = '6iyvVReFPQdfxf3tTRl2nAdx1iaBm70KyQpG6+Ka1U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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