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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7bcf31e0d426cf672cceddab664879314dc86b22980e2fe7a6549caa00395c2' 
  AND token = 'J+I+PwfgeiDcSyiypqnSkP1fny8ndInh+5YyTkI6s3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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