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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7aa820e7fd4e3e3226ef73e3e4c63cc2e6d08693056e8f5c9c0e4769c540dfaa' 
  AND token = '2ZobI+1T6iGpdcyeYgRQQm6sS90EGpHhQOOkQNAyKeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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