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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f67ad4e4ee90b7571339a6bec331f0a83828421c52dac021800a01d4bcad358e' 
  AND token = '7H4L6pUI4npgnImOHNFOkgG06nS0Be0OYtgWElD1Ea0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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