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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0462d18999c9f39d36a9a936887e952e269960e7c06ef630e86427d9a5ce0ec' 
  AND token = '1jxx5ByYvobjJRZh2VY5dSQqHbeABSOjkx3SjSbxXDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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