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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96c2f4a6d3b922bf5eccc9cf8591de8dd614233d89ac4cb2f3489310daeaabf2' 
  AND token = 'gZWWqYIGbjKsOi6AEqVZFT6qlxbhU2u4+f3kpEGnykc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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