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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c18328d16f0c4a6c52f7d86e538f31cf4b17cf645c986d420a9139483f38ee90' 
  AND token = 'n2zkppssel3KstRBSXOFBmr5k5i51iILdIsUrhzGYtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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