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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d3fb0b4052acac2775f60b5b1447994d583c924dc3c6699670ee9169e3617df' 
  AND token = 'AuBLsA0IX7HDEr137lEZKiVIsk+mZ9RudQhW25Lb8FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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