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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '851396af94fd2073a1a55d6a3da1f8fc771707dc834458e82af7398a40b4c22f' 
  AND token = 'P75M73BqWd9R/X64qxfa1nk0x8PajLDaYinLqoUd4uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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