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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '444a86d35266e0fd84727d68e1ee46a02b5c752c0d2ea735161ed0037e1c4037' 
  AND token = 'k1PeGyAtvVLCE34nh0ZyZszNBCXFoedBSHC2zLd07vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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