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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5268b586331bcc4fabb80dc3480c78a4edcc56900c6c6c578172425bf5660db9' 
  AND token = 'cseijm5Aok5NFbfyilKVV59RNRUvuKYcHuWI+7mu5LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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