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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0986db6807bcfb1cbba6e96bb5ae66df0157144cc5705060ec8fc88ef06bafea' 
  AND token = 'S7CqYSjZFSGpaO/1/HlpqUu2rQrCHAK6+h1Rp/qO+Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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