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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67d55be9326da0f2f5c531ed06f2f8d61a61de1eb4197d7e8f5072352faf147b' 
  AND token = '5FA+2dDALBJQkN0tTF7eeI5QxIx0TtfO6kcmLdzxhyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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