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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac47087dce4ee675855c5bb0f24282f736a607904d842b51d159b3bc2902d4fd' 
  AND token = 'ETE6gnQ0OSFi+gU6eeVWLdUU3vPACyL5q5KgNkHyXE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00398

JSON explain

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