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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a9ec9aa005e2c7bfe8d3e2ba9065b7d8bdf2e1e30965113bebd201da3e2d664' 
  AND token = 'nlXX1vNF+fbhxXnz+7SrzrmBSum+eFY73CCo+9K/JzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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