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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8623f8e63c4733ad1b98460d8a980896b293b74cf3081df20db96c0310f2fcb1' 
  AND token = 'fM9Dsh0W1ywILRJCG7qQ1U1Wp+DqEw208BqyDuKUjkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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