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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '758957b9437babf46a67d84e470dc2ef3013f41d9b5172a0f4c7fd526346a33a' 
  AND token = 'GhVMG5YmsS61QkKbe/rE1ZAIm26soD7X2979lan4nUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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