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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01ca512c3dd0c8ad6d496b3a8ea467dd6caf239f374dbfec19639de5d81b5dee' 
  AND token = 'fEeqBU24W3HDNdkNDo3AVZwiIWehuiJtf7zGh4Fl4nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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