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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b04b65dc41f34cc08b123e6ec785a6163503a370dccbc342200b86450b78e2a' 
  AND token = '2rks9xsYrOZREU4KQNEmf/3oY3MIbBx0mlvIaBwRP1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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