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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4178f3ea7d6bb6fd54bab26e3270c0104bcd08f1f1a083a0705a1288bff85d95' 
  AND token = 'vZQRkCQOS8ojSml9TLLHRjbYsne6FcuKk4pKmRoneSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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